Caspase-1 activity affects AIM2 speck formation/stability through a negative feedback loop.

Details

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State: Public
Version: Final published version
Serval ID
serval:BIB_1245AFD27327
Type
Article: article from journal or magazin.
Collection
Publications
Title
Caspase-1 activity affects AIM2 speck formation/stability through a negative feedback loop.
Journal
Frontiers in Cellular and Infection Microbiology
Author(s)
Juruj C., Lelogeais V., Pierini R., Perret M., Py B.F., Jamilloux Y., Broz P., Ader F., Faure M., Henry T.
ISSN
2235-2988 (Print)
ISSN-L
2235-2988
Publication state
Published
Issued date
2013
Peer-reviewed
Oui
Volume
3
Pages
14
Language
english
Abstract
The inflammasome is an innate immune signaling platform leading to caspase-1 activation, maturation of pro-inflammatory cytokines and cell death. Recognition of DNA within the host cytosol induces the formation of a large complex composed of the AIM2 receptor, the ASC adaptor and the caspase-1 effector. Francisella tularensis, the agent of tularemia, replicates within the host cytosol. The macrophage cytosolic surveillance system detects Francisella through the AIM2 inflammasome. Upon Francisella novicida infection, we observed a faster kinetics of AIM2 speck formation in ASC(KO) and Casp1(KO) as compared to WT macrophages. This observation was validated by a biochemical approach thus demonstrating for the first time the existence of a negative feedback loop controlled by ASC/caspase-1 that regulates AIM2 complex formation/stability. This regulatory mechanism acted before pyroptosis and required caspase-1 catalytic activity. Our data suggest that sublytic caspase-1 activity could delay the formation of stable AIM2 speck, an inflammasome complex associated with cell death.

Keywords
Animals, Apoptosis Regulatory Proteins, CARD Signaling Adaptor Proteins, Caspase 1/genetics, Caspase 1/metabolism, Cell Death, Cell Line, Cytoskeletal Proteins/genetics, DNA-Binding Proteins, Feedback, Francisella tularensis/immunology, Gene Deletion, Humans, Macrophages/immunology, Macrophages/microbiology, Mice, Mice, Inbred C57BL, Mice, Knockout, Nuclear Proteins/metabolism, AIM2, Francisella tularensis, caspase-1, inflammasome, regulation
Pubmed
Web of science
Open Access
Yes
Create date
25/10/2017 10:05
Last modification date
20/08/2019 12:40
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